ChemInform Abstract: Synthesis and Conductivity of Solid Perovskite‐Like Solutions (Bi,Sr)( Fe,Mn)O3.

Tolochko, S.P.; Kononyuk, I.F.; Lomonosov, V. A.; Ivashkevich, Ludmila S.; Lyakhov, Alexander S.

doi:10.1002/chin.199430031

Cited by 2 publications

(2 citation statements)

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“…After each heating step, the reaction mixtures were ball-milled for another hour. Following the preparation method reported for Bi 0.2 Sr 0.8 CoO 3-δ , 26 Co-containing powders were isostatically coldpressed into cylindrical pellets with about 1 cm in diameter prior to each heating step (BiSCF5040) or before the last heating step (BiSCF5020) and in some cases quenched to room temperature. For electrical conductivity measurements, pellets of the Co-free compositions were produced by spark plasma sintering (SPS).…”

Section: Methodsmentioning

confidence: 99%

Oxygen Exchange Kinetics of (Bi,Sr)(Co,Fe)O_3-_δThin-Film Microelectrodes

Wedig

Merkle

Maier

2013

J. Electrochem. Soc.

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Mixed-conducting (Bi,Sr)(Co,Fe)O 3-δ (BiSCF) perovskites are considered to be promising candidates for the application as cathode materials in solid oxide fuel cells (SOFCs) operating in the intermediate-temperature regime. In this study, the effective rate constants of surface oxygen exchange of both Co-free and Co-containing BiSCF perovskites were measured by electrochemical impedance spectroscopy (EIS) on geometrically well-defined thin-film microelectrodes on Y 2 O 3 -doped ZrO 2 (YSZ) single crystal substrates. Oxygen exchange rate constants in the range of 3.0 × 10 −7 cm s −1 to 2.4 × 10 −6 cm s −1 at 750 • C and an oxygen partial pressure p(O 2 ) of 0.2 bar were obtained, which are higher in particular for Co-containing BiSCF than those of La-containing perovskites. The interrelation between the oxygen exchange rate constant and other material properties was investigated to derive information about the oxygen exchange mechanism. A correlation between the oxygen exchange rate constant and the ionic conductivity from thin-film electrochemical polarization experiments and measurements on bulk samples in the range of 1.4 × 10 −2 S cm −1 to 2.6 × 10 −1 S cm −1 at 650 • C was observed that is similar to the correlation found for Ba-containing perovskites. This suggests oxygen vacancy diffusion to be involved in the rate-determining step (rds) of the oxygen exchange reaction.

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Section: Methodsmentioning

confidence: 99%

Oxygen Exchange Kinetics of (Bi,Sr)(Co,Fe)O_3-_δThin-Film Microelectrodes

Wedig

Merkle

Maier

2013

J. Electrochem. Soc.

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“…Previous reports on perovskites with Bi 3+ at the A-site include diffraction and Mö ssbauer studies of Bi 1Àx Sr x FeO 3 [7,8], and investigations of the structure and properties of Sr 1Àx Bi x CoO 3Ày [9,10] that revealed formation of the I4/mmm supercell for 0.1pxp0.2 [10]. Motivated by a wish to understand how the B-site ion controls both the crystal structure and the magnetic properties of these phases we here present an investigation of the influence of iron introduction into Sr 0.85 Bi 0.15 CoO 3Ày [10].…”

Section: Introductionmentioning

confidence: 99%